This sentence uses figurative rhetoric, comparing "loving mother" to the earth and "strict father" to the sky, which fully embodies the reason that loving mother strict father needs to exist. Every healthy child should have a kind, kind and loving mother to give her warmth, encouragement and help, but only loving mother's love is not enough. This kind of love is just doting and will only lead her children astray. At this time, it is necessary to have a strict father, a serious, deep and implicit father who knows how to suppress children's pride and properly criticize and educate children when they make mistakes. These two extreme forces can balance a person's psychology, but they are neither too proud nor too inferior, and face life with an open mind. But the starting point of these two forces is the same-that is, love, whether a loving mother or strict father, loves her children deeply and is good for them. Therefore, these two kinds of love are the earth and the sky. Only when they are together can we form a harmonious, happy and happy world and cultivate a hardworking, polite and excellent child. I hope it helps you. PS: The landlord can read "wonderful" and "terrible" articles, which is the reason.